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annotate test/testalpha.c @ 2848:8a3aa505ecba

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Comment cleanup.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 07 Dec 2008 07:16:40 +0000
parents cf271ff76061
children f8816ffa210b
rev   line source
0
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1
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2 /* Simple program: Fill a colormap with gray and stripe it down the screen,
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3 Then move an alpha valued sprite around the screen.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <math.h>
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10
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11 #include "SDL.h"
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12
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13 #define FRAME_TICKS (1000/30) /* 30 frames/second */
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14
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15 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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16 static void
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17 quit(int rc)
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18 {
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19 SDL_Quit();
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20 exit(rc);
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21 }
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22
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23 /* Fill the screen with a gradient */
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24 static void
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25 FillBackground(SDL_Surface * screen)
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26 {
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27 Uint8 *buffer;
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28 Uint8 gradient;
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29 int i, k;
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30
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31 /* Set the surface pixels and refresh! */
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32 if (SDL_LockSurface(screen) < 0) {
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33 fprintf(stderr, "Couldn't lock the display surface: %s\n",
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34 SDL_GetError());
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35 quit(2);
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36 }
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37 buffer = (Uint8 *) screen->pixels;
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38 switch (screen->format->BytesPerPixel) {
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39 case 1:
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40 case 3:
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41 for (i = 0; i < screen->h; ++i) {
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42 memset(buffer, (i * 255) / screen->h,
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43 screen->w * screen->format->BytesPerPixel);
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44 buffer += screen->pitch;
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45 }
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46 break;
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47 case 2:
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48 for (i = 0; i < screen->h; ++i) {
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49 Uint16 *buffer16;
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50 Uint16 color;
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51
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52 gradient = ((i * 255) / screen->h);
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53 color = (Uint16) SDL_MapRGB(screen->format,
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54 gradient, gradient, gradient);
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55 buffer16 = (Uint16 *) buffer;
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56 for (k = 0; k < screen->w; k++) {
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57 *buffer16++ = color;
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58 }
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59 buffer += screen->pitch;
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60 }
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61 break;
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62 case 4:
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63 for (i = 0; i < screen->h; ++i) {
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64 Uint32 *buffer32;
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65 Uint32 color;
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66
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67 gradient = ((i * 255) / screen->h);
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68 color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
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69 buffer32 = (Uint32 *) buffer;
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70 for (k = 0; k < screen->w; k++) {
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71 *buffer32++ = color;
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72 }
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73 buffer += screen->pitch;
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74 }
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75 break;
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76 }
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77
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78 SDL_UnlockSurface(screen);
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79 SDL_UpdateRect(screen, 0, 0, 0, 0);
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80 }
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81
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82 /* Create a "light" -- a yellowish surface with variable alpha */
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83 SDL_Surface *
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84 CreateLight(int radius)
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85 {
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86 Uint8 trans, alphamask;
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87 int range, addition;
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88 int xdist, ydist;
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89 Uint16 x, y;
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90 Uint16 skip;
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91 Uint32 pixel;
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92 SDL_Surface *light;
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93
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94 #ifdef LIGHT_16BIT
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95 Uint16 *buf;
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96
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97 /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */
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98 /* Note: this isn't any faster than a 32 bit alpha surface */
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99 alphamask = 0x0000000F;
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100 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 16,
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101 0x0000F000, 0x00000F00, 0x000000F0,
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102 alphamask);
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103 #else
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104 Uint32 *buf;
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105
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106 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */
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107 alphamask = 0x000000FF;
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108 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 32,
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109 0xFF000000, 0x00FF0000, 0x0000FF00,
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110 alphamask);
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111 if (light == NULL) {
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112 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError());
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113 return (NULL);
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114 }
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115 #endif
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116
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117 /* Fill with a light yellow-orange color */
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118 skip = light->pitch - (light->w * light->format->BytesPerPixel);
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119 #ifdef LIGHT_16BIT
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120 buf = (Uint16 *) light->pixels;
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121 #else
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122 buf = (Uint32 *) light->pixels;
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123 #endif
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124 /* Get a tranparent pixel value - we'll add alpha later */
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125 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0);
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126 for (y = 0; y < light->h; ++y) {
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127 for (x = 0; x < light->w; ++x) {
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128 *buf++ = pixel;
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129 }
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130 buf += skip; /* Almost always 0, but just in case... */
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131 }
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132
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133 /* Calculate alpha values for the surface. */
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134 #ifdef LIGHT_16BIT
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135 buf = (Uint16 *) light->pixels;
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136 #else
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137 buf = (Uint32 *) light->pixels;
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138 #endif
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139 for (y = 0; y < light->h; ++y) {
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140 for (x = 0; x < light->w; ++x) {
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141 /* Slow distance formula (from center of light) */
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142 xdist = x - (light->w / 2);
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143 ydist = y - (light->h / 2);
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144 range = (int) sqrt(xdist * xdist + ydist * ydist);
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145
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146 /* Scale distance to range of transparency (0-255) */
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147 if (range > radius) {
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148 trans = alphamask;
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149 } else {
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150 /* Increasing transparency with distance */
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151 trans = (Uint8) ((range * alphamask) / radius);
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152
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153 /* Lights are very transparent */
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154 addition = (alphamask + 1) / 8;
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155 if ((int) trans + addition > alphamask) {
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156 trans = alphamask;
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157 } else {
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158 trans += addition;
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159 }
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160 }
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161 /* We set the alpha component as the right N bits */
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162 *buf++ |= (255 - trans);
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163 }
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164 buf += skip; /* Almost always 0, but just in case... */
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165 }
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166 /* Enable RLE acceleration of this alpha surface */
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167 SDL_SetAlpha(light, SDL_SRCALPHA | SDL_RLEACCEL, 0);
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168
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169 /* We're done! */
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170 return (light);
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171 }
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172
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173 static Uint32 flashes = 0;
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174 static Uint32 flashtime = 0;
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175
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176 void
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177 FlashLight(SDL_Surface * screen, SDL_Surface * light, int x, int y)
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178 {
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179 SDL_Rect position;
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180 Uint32 ticks1;
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181 Uint32 ticks2;
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182
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183 /* Easy, center light */
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184 position.x = x - (light->w / 2);
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185 position.y = y - (light->h / 2);
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186 position.w = light->w;
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187 position.h = light->h;
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188 ticks1 = SDL_GetTicks();
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189 SDL_BlitSurface(light, NULL, screen, &position);
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190 ticks2 = SDL_GetTicks();
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191 SDL_UpdateRects(screen, 1, &position);
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192 ++flashes;
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193
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194 /* Update time spend doing alpha blitting */
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195 flashtime += (ticks2 - ticks1);
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196 }
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197
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198 static int sprite_visible = 0;
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199 static SDL_Surface *sprite;
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200 static SDL_Surface *backing;
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201 static SDL_Rect position;
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202 static int x_vel, y_vel;
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203 static int alpha_vel;
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204
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205 int
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206 LoadSprite(SDL_Surface * screen, char *file)
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207 {
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208 SDL_Surface *converted;
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209
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210 /* Load the sprite image */
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211 sprite = SDL_LoadBMP(file);
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212 if (sprite == NULL) {
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213 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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214 return (-1);
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215 }
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216
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217 /* Set transparent pixel as the pixel at (0,0) */
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218 if (sprite->format->palette) {
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219 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, *(Uint8 *) sprite->pixels);
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220 }
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diff changeset
221
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222 /* Convert sprite to video format */
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223 converted = SDL_DisplayFormat(sprite);
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224 SDL_FreeSurface(sprite);
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225 if (converted == NULL) {
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226 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
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227 return (-1);
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228 }
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229 sprite = converted;
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230
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231 /* Create the background */
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232 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8,
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233 0, 0, 0, 0);
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234 if (backing == NULL) {
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235 fprintf(stderr, "Couldn't create background: %s\n", SDL_GetError());
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236 SDL_FreeSurface(sprite);
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237 return (-1);
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238 }
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239
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240 /* Convert background to video format */
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241 converted = SDL_DisplayFormat(backing);
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242 SDL_FreeSurface(backing);
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243 if (converted == NULL) {
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244 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
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245 SDL_FreeSurface(sprite);
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246 return (-1);
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247 }
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248 backing = converted;
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249
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250 /* Set the initial position of the sprite */
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251 position.x = (screen->w - sprite->w) / 2;
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252 position.y = (screen->h - sprite->h) / 2;
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253 position.w = sprite->w;
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254 position.h = sprite->h;
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255 x_vel = 0;
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256 y_vel = 0;
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257 alpha_vel = 1;
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258
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259 /* We're ready to roll. :) */
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260 return (0);
0
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261 }
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262
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263 void
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264 AttractSprite(Uint16 x, Uint16 y)
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265 {
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266 x_vel = ((int) x - position.x) / 10;
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267 y_vel = ((int) y - position.y) / 10;
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268 }
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269
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270 void
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271 MoveSprite(SDL_Surface * screen, SDL_Surface * light)
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272 {
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273 SDL_Rect updates[2];
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274 Uint8 alpha;
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275
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276 /* Erase the sprite if it was visible */
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277 if (sprite_visible) {
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278 updates[0] = position;
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279 SDL_BlitSurface(backing, NULL, screen, &updates[0]);
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280 } else {
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281 updates[0].x = 0;
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282 updates[0].y = 0;
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283 updates[0].w = 0;
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284 updates[0].h = 0;
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285 sprite_visible = 1;
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286 }
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287
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288 /* Since the sprite is off the screen, we can do other drawing
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289 without being overwritten by the saved area behind the sprite.
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290 */
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291 if (light != NULL) {
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292 int x, y;
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293
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294 SDL_GetMouseState(0, &x, &y);
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295 FlashLight(screen, light, x, y);
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296 }
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297
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298 /* Move the sprite, bounce at the wall */
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299 position.x += x_vel;
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300 if ((position.x < 0) || (position.x >= screen->w)) {
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301 x_vel = -x_vel;
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302 position.x += x_vel;
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303 }
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304 position.y += y_vel;
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305 if ((position.y < 0) || (position.y >= screen->h)) {
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306 y_vel = -y_vel;
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307 position.y += y_vel;
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308 }
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309
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310 /* Update transparency (fade in and out) */
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diff changeset
311 SDL_GetSurfaceAlphaMod(sprite, &alpha);
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312 if (((int) alpha + alpha_vel) < 0) {
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313 alpha_vel = -alpha_vel;
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314 } else if (((int) alpha + alpha_vel) > 255) {
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315 alpha_vel = -alpha_vel;
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316 }
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317 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8) (alpha + alpha_vel));
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318
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319 /* Save the area behind the sprite */
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320 updates[1] = position;
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321 SDL_BlitSurface(screen, &updates[1], backing, NULL);
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322
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323 /* Blit the sprite onto the screen */
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324 updates[1] = position;
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325 SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
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326
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
327 /* Make it so! */
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328 SDL_UpdateRects(screen, 2, updates);
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329 }
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330
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331 int
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332 main(int argc, char *argv[])
0
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333 {
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334 const SDL_VideoInfo *info;
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335 SDL_Surface *screen;
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336 int w, h;
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diff changeset
337 Uint8 video_bpp;
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338 Uint32 videoflags;
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diff changeset
339 int i, done;
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diff changeset
340 SDL_Event event;
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diff changeset
341 SDL_Surface *light;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
342 int mouse_pressed;
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diff changeset
343 Uint32 ticks, lastticks;
691
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diff changeset
344
0
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diff changeset
345
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diff changeset
346 /* Initialize SDL */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
347 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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348 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
349 return (1);
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diff changeset
350 }
0
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351
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diff changeset
352 /* Alpha blending doesn't work well at 8-bit color */
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diff changeset
353 #ifdef _WIN32_WCE
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354 /* Pocket PC */
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355 w = 240;
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diff changeset
356 h = 320;
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diff changeset
357 #else
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diff changeset
358 w = 640;
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diff changeset
359 h = 480;
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diff changeset
360 #endif
1895
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diff changeset
361 info = SDL_GetVideoInfo();
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diff changeset
362 if (info->vfmt->BitsPerPixel > 8) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
363 video_bpp = info->vfmt->BitsPerPixel;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
364 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
365 video_bpp = 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
366 fprintf(stderr, "forced 16 bpp mode\n");
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diff changeset
367 }
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diff changeset
368 videoflags = SDL_SWSURFACE;
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diff changeset
369 for (i = 1; argv[i]; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
370 if (strcmp(argv[i], "-bpp") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
371 video_bpp = atoi(argv[++i]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
372 if (video_bpp <= 8) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
373 video_bpp = 16;
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
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parents: 0
diff changeset
374 fprintf(stderr, "forced 16 bpp mode\n");
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
375 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
376 } else if (strcmp(argv[i], "-hw") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
377 videoflags |= SDL_HWSURFACE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
378 } else if (strcmp(argv[i], "-warp") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
379 videoflags |= SDL_HWPALETTE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
380 } else if (strcmp(argv[i], "-width") == 0 && argv[i + 1]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
381 w = atoi(argv[++i]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
382 } else if (strcmp(argv[i], "-height") == 0 && argv[i + 1]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
383 h = atoi(argv[++i]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
384 } else if (strcmp(argv[i], "-resize") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
385 videoflags |= SDL_RESIZABLE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
386 } else if (strcmp(argv[i], "-noframe") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
387 videoflags |= SDL_NOFRAME;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1779
diff changeset
388 } else if (strcmp(argv[i], "-fullscreen") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
389 videoflags |= SDL_FULLSCREEN;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
390 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
391 fprintf(stderr,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
392 "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
393 argv[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
394 quit(1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
395 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
396 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
397
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
398 /* Set video mode */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
399 if ((screen = SDL_SetVideoMode(w, h, video_bpp, videoflags)) == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
400 fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
401 w, h, video_bpp, SDL_GetError());
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
402 quit(2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
403 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
404 FillBackground(screen);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
406 /* Create the light */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
407 light = CreateLight(82);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
408 if (light == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
409 quit(1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
410 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
412 /* Load the sprite */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
413 if (LoadSprite(screen, "icon.bmp") < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
414 SDL_FreeSurface(light);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
415 quit(1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
416 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
418 /* Print out information about our surfaces */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
419 printf("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
420 if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
421 printf("Screen is in video memory\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
422 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
423 printf("Screen is in system memory\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
424 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
425 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
426 printf("Screen has double-buffering enabled\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
427 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
428 if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
429 printf("Sprite is in video memory\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
430 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
431 printf("Sprite is in system memory\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
432 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
434 /* Run a sample blit to trigger blit acceleration */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
435 MoveSprite(screen, NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
436 if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
437 printf("Sprite blit uses hardware alpha acceleration\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
438 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
439 printf("Sprite blit dosn't uses hardware alpha acceleration\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
440 }
886
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
441
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
442 /* Set a clipping rectangle to clip the outside edge of the screen */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
443 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
444 SDL_Rect clip;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
445 clip.x = 32;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
446 clip.y = 32;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
447 clip.w = screen->w - (2 * 32);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
448 clip.h = screen->h - (2 * 32);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
449 SDL_SetClipRect(screen, &clip);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
450 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
452 /* Wait for a keystroke */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
453 lastticks = SDL_GetTicks();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
454 done = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
455 mouse_pressed = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
456 while (!done) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
457 /* Update the frame -- move the sprite */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
458 if (mouse_pressed) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
459 MoveSprite(screen, light);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
460 mouse_pressed = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
461 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
462 MoveSprite(screen, NULL);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
463 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
465 /* Slow down the loop to 30 frames/second */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
466 ticks = SDL_GetTicks();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
467 if ((ticks - lastticks) < FRAME_TICKS) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 #ifdef CHECK_SLEEP_GRANULARITY
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
469 fprintf(stderr, "Sleeping %d ticks\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
470 FRAME_TICKS - (ticks - lastticks));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
472 SDL_Delay(FRAME_TICKS - (ticks - lastticks));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 #ifdef CHECK_SLEEP_GRANULARITY
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
474 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks() - ticks));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
476 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
477 lastticks = ticks;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
479 /* Check for events */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
480 while (SDL_PollEvent(&event)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
481 switch (event.type) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
482 case SDL_VIDEORESIZE:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
483 screen =
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
484 SDL_SetVideoMode(event.resize.w, event.resize.h,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
485 video_bpp, videoflags);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
486 if (screen) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
487 FillBackground(screen);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
488 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
489 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
490 /* Attract sprite while mouse is held down */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
491 case SDL_MOUSEMOTION:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
492 if (event.motion.state != 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
493 AttractSprite(event.motion.x, event.motion.y);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
494 mouse_pressed = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
495 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
496 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
497 case SDL_MOUSEBUTTONDOWN:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
498 if (event.button.button == 1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
499 AttractSprite(event.button.x, event.button.y);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
500 mouse_pressed = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
501 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
502 SDL_Rect area;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
504 area.x = event.button.x - 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
505 area.y = event.button.y - 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
506 area.w = 32;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
507 area.h = 32;
2806
938aa47f903a Fixed testalpha screen clear for screen formats with an alpha channel
Sam Lantinga <slouken@libsdl.org>
parents: 2799
diff changeset
508 SDL_FillRect(screen, &area,
938aa47f903a Fixed testalpha screen clear for screen formats with an alpha channel
Sam Lantinga <slouken@libsdl.org>
parents: 2799
diff changeset
509 SDL_MapRGB(screen->format, 0, 0, 0));
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
510 SDL_UpdateRects(screen, 1, &area);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
511 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
512 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
513 case SDL_KEYDOWN:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
514 if (event.key.keysym.sym == SDLK_ESCAPE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
515 done = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
516 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
517 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
518 case SDL_QUIT:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
519 done = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
520 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
521 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
522 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
523 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
524 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
525 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
526 SDL_FreeSurface(light);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
527 SDL_FreeSurface(sprite);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
528 SDL_FreeSurface(backing);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
529
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
530 /* Print out some timing information */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
531 if (flashes > 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
532 printf("%d alpha blits, ~%4.4f ms per blit\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
533 flashes, (float) flashtime / flashes);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
534 }
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
535
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
536 SDL_Quit();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1779
diff changeset
537 return (0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
538 }